Improved die-stock



UNITED STATES PATENT OFFICE.

IMPROVED DIE-STOCK.

' Specification forming part of Letters Patent No. 19,687,

To all whom it may concern.-

Be it known that I, the Kingdom of Bavaria, have invented a newDie-Stock for the purpose of cutting threads upon very small bolts, suchas are used in watches, mathematical instruments, 850.; and I herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon and forming part of thisspecification, in which-- Figure 1 is a perspective view of the stockand dies, the stock being opened. Fig. 2 is a plan of the stock closedup.

The nature of this invention consists in makin g the stock in twopieces, hinged together at one end and open at the other, whichterminate in small handles, which may be grasped by the operator andbrought together at his will, so as to close up against the bolt whichis placed between the dies. l

The stock A is made of steel or other suitable metal, and the two sidesor parts of it are hinged together at a, while the other ends of themterminate in the handles 1). There are recesses left in the inner sidesof the stockis a small set-screw, c, which may be set so as pieces, intowhich the diesB are fitted. There to keep the two parts of the stock ata certain dated August 29, 1865.

distance from each other, so as to make the JOSEPH KOBERLE, of dies outthe threads on a bolt of any required size.

WVhen the operator wishes to use the stock he can take the stock betweenhis thumb and forefinger and bring it up onto the bolt with a pressurewhich he can readily feel with his fingers to be as much as the bolt canstand; but if he should inadvertently apply too-much pressure and twistthe bolt ofi', he can remove the broken piece from the die in a momentby opening the die and dropping the broken piece out.

If the operator should wish to cut a thread on a bolt with a conicalend, all he will have to do will be to file off the end of the bolt tothe required conical shape and then apply the stock and dies, which willaccommodate them selves to the required position by the delicatepressure of the thumb and fingers.

Having described my invention what I claim, and desire to secure byLetters Patent, is-

The several parts, arranged and employed as described in thisspecification.

JOSEPH KOBERLE.

Witnesses M. BAND OLPH, A. WAGNER.

